20021121142 has 16 divisors (see below), whose sum is σ = 34486142400. Its totient is φ = 8621535240.

The previous prime is 20021121139. The next prime is 20021121157. The reversal of 20021121142 is 24112112002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23948292 + ... + 23949127.

It is an arithmetic number, because the mean of its divisors is an integer number (2155383900).

Almost surely, 2^20021121142 is an apocalyptic number.

20021121142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20021121142 is a deficient number, since it is larger than the sum of its proper divisors (14465021258).

20021121142 is a wasteful number, since it uses less digits than its factorization.

20021121142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47897451.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021121142 its reverse (24112112002), we get a palindrome (44133233144).

The spelling of 20021121142 in words is "twenty billion, twenty-one million, one hundred twenty-one thousand, one hundred forty-two".